What is the name of the Islamic religious document that has to be issued by a high-ranking religious official before killing to defend faith is considered just?

Question

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A fatwa is a formal ruling or interpretation on a point of Islamic law given by a qualified legal scholar (mufti). In the context of this question, a fatwa could be issued to declare that a particular act of killing is justified within Islamic law to defend the faith.

What Is the Name of the Islamic Religious Document That